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CVE-2026-16089— Keycloak-services: keycloak-services: authorization codes can be retargeted to another client session

Quick assessment

Affected
Red Hat Red Hat build of Keycloak 26.6
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Keycloak是Keycloak组织开源的一种身份和访问管理解决方案。 keycloak存在安全漏洞，该漏洞源于keycloak-services组件中OAuth 2.0授权码未正确绑定到原始请求的客户端，可能导致攻击者拦截授权码并修改后通过自己的客户端兑换，从而获取受害者身份访问令牌。

CVSS 5.4 · Medium EPSS 0.29% · P20

Affected Version Matrix 9

VendorProduct Version RangeStatus
Red Hat Red Hat build of Keycloak 26.6 26.6.7-3< * unaffected
26.6-20< * unaffected
26.6-20< * unaffected
Red Hat Red Hat build of Keycloak 26.6.7 any unaffected
any unaffected
any unaffected
Red Hat Red Hat Data Grid 8 any unaffected
Red Hat Red Hat JBoss Enterprise Application Platform Expansion Pack any unaffected
Red Hat Red Hat Single Sign-On 7 any unaffected
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I. Basic Information for CVE-2026-16089

Vulnerability Information
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Vulnerability Title
Keycloak-services: keycloak-services: authorization codes can be retargeted to another client session
Source: CVE Program / CVE List V5
Vulnerability Description
A flaw was found in the keycloak-services component of Red Hat Build of Keycloak. The issue occurs because OAuth 2.0 authorization codes are not properly bound to the client that originally requested them. An attacker who can intercept an authorization code can modify it to be redeemed by their own client, potentially allowing them to obtain access tokens for a victim's identity.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对假设不可变Web参数的外部可控制
Source: CVE Program / CVE List V5
Vulnerability Title
Keycloak 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Keycloak是Keycloak组织开源的一种身份和访问管理解决方案。 keycloak存在安全漏洞，该漏洞源于keycloak-services组件中OAuth 2.0授权码未正确绑定到原始请求的客户端，可能导致攻击者拦截授权码并修改后通过自己的客户端兑换，从而获取受害者身份访问令牌。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Red Hat Red Hat build of Keycloak 26.6 26.6.7-3 ~ * cpe:/a:redhat:build_keycloak:26.6::el9
Red Hat Red Hat build of Keycloak 26.6 26.6-20 ~ * cpe:/a:redhat:build_keycloak:26.6::el9
Red Hat Red Hat build of Keycloak 26.6 26.6-20 ~ * cpe:/a:redhat:build_keycloak:26.6::el9
Red Hat Red Hat build of Keycloak 26.6.7 - cpe:/a:redhat:build_keycloak:26.6::el9
Red Hat Red Hat build of Keycloak 26.6.7 - cpe:/a:redhat:build_keycloak:26.6::el9
Red Hat Red Hat build of Keycloak 26.6.7 - cpe:/a:redhat:build_keycloak:26.6::el9
Red Hat Red Hat Data Grid 8 - cpe:/a:redhat:jboss_data_grid:8
Red Hat Red Hat JBoss Enterprise Application Platform Expansion Pack - cpe:/a:redhat:jbosseapxp
Red Hat Red Hat Single Sign-On 7 - cpe:/a:redhat:red_hat_single_sign_on:7

II. Public POCs for CVE-2026-16089

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III. Intelligence Information for CVE-2026-16089

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Vendor Advisories for CVE-2026-16089 (3)

Same Patch Batch · Red Hat · 2026-07-17 · 8 CVEs total

CVE-2026-15943 5.5 MEDIUM Keycloak-services: keycloak-services: oidc idp update reuses masked client secret after to
CVE-2026-16093 5.4 MEDIUM Keycloak-services: keycloak-services: required signed-jwt assertion policy can be bypassed
CVE-2026-16106 4.9 MEDIUM Keycloak-services: keycloak-services: incorrect authorization in admin role-composite dele
CVE-2026-16072 4.9 MEDIUM Keycloak-services: keycloak-services: organization invitation link exposure allows unautho
CVE-2026-16104 4.3 MEDIUM Keycloak-services: keycloak-services: authenticator config endpoint exposes raw recaptcha
CVE-2026-16103 4.3 MEDIUM Keycloak-services: keycloak-services: incomplete fix for ciba brute-force lockout bypass a
CVE-2026-16108 4.3 MEDIUM Keycloak-services: keycloak-services: realm default-group reads disclose hidden groups und

IV. Related Vulnerabilities

Same product: Red Hat build of Keycloak 26.6
Same vendor: Red Hat
Same weakness: CWE-472

V. Comments for CVE-2026-16089

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